摘要
主要围绕片式叠层用PTC纳米粉体的水热制备方法进行研究，采用钛酸四丁酯和乙酸钡为反应原料，通过XRD分析了水热环境pH值、反应前驱物钡钛比、钡源添加形式等工艺因素对粉体晶相及杂质组成等性能参数的影响。通过化学沉淀和溶液滴定方法研究了反应前驱物的Ba／Ti比对生成粉体化学计量比的影响。实验结果表明：当水热反应的pH值为14时，将Ba（Ac）21Ti（OC4H9）4按照化学计量比为1配置的前驱物置于饱和氢氧化钡溶液构成的富钡环境下进行水热反应，合成了化学计量比为1．027、晶粒尺寸30nm左右的立方相钛酸钡纳米粉。
Hydrothermal method was an attractive chemical method, and the prepared barium titanate powders had a good performance of high purity, non-agglomeration and so on. This paper focuses on the hydrothermal synthesis of PTC nanometer powders, and pure barium titanate powders were synthesized firstly. The technological process and fundamental principle of hydrothermal reaction for the synthesis of BaTiO3 were introduced in this article. By the comparison of the advantages and disadvantages of different precursors, Ba（Ac）2 and Ti（OC4H9）4 were used as starting materials. Then the effects of pH value and Ba/Ti on the structure and morphology of BaTiO3 powders were studied by XRD and TEM. Through the chemical methods, the effects of Ba/Ti on the synthesized BaTiO3 were also studied. The stoichiometric BaTiO3 was obtained by hydrothermal reaction from the stoichiometric precursor （Ba（Ac）2/Ti（OC4H9）4： 1.0） in the saturated Ba（OH）2 solution. And the BaTiO3 powder was cubic and the size of crystallites was around 30 nm.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A06期2122-2126,共5页
Journal of Functional Materials
基金
基金项目：湖北大学铁电、压电材料与器件湖北省重点实验室开放基金资助项目（2007TY10）
湖北省耐火材料与高温陶瓷重点实验室-省部共建国家重点实验室培育基地开放基金资助项目（G0606）
关键词
水热法
钛酸钡
纳米粉体
hydrothermal method
barium titanate
nanometer powders
